A radio station sends out its signal via a (20-mathrm{kW}) emitting antenna. Assuming the signal is emitted

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A radio station sends out its signal via a \(20-\mathrm{kW}\) emitting antenna. Assuming the signal is emitted equally in all directions and no signal strength is lost, how much power per unit area remains in the signal at a location \(10 \mathrm{~km}\) from the emitting antenna?

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